Your project may be free-as-in-speech, but that doesn’t mean it has to be free-as-in-beer. This handy coin validator/acceptor module is just like the ones you’ve seen in arcades. First, program it with what coin you want it to accept, any coin from 10.8mm to 25.1mm in diameter can be used. When a valid coin is inserted, the output line will pulse for 20-60ms (configurable). The acceptor looks for diameter, thickness, dropping speed, etc to determine if a coin is valid. You can select 3 different “strictness” levels.
Comes with the acceptor itself, mounting hardware, and a cable for power/signal.
To program the validator: power with 12VDC (red wire goes to +12VDC, black wire to common ground). Press and hold the little button on top for 5 seconds and release. The LED will be on. Now insert 30 sample coins of the value you want to detect (say 30 quarters or 30 Euro coins). Once the LED goes out it’s programmed! Connect a 10K (1K to 100K is fine) pullup resistor from the white wire to your microcontroller’s VCC line (for Arduino, this is a +5V). Insert a coin, and verify that the LED line pulses high for about 40 milliseconds.
Power requirements: 12VDC (+- 20%)
Quiescent current: ~25mA
Peak current (for solenoid): 400mA
Accepts coins from 10.8mm to 15.1mm in diameter, 1.2mm to 3.0mm thick
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
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